Part 1 MQTT – Arduino to Geeknesia

“Geeknesia” has already introduced on WIZnetMuseum website. “Geeknesia” is an Internet Of Things platform such as ThingSpeak but, it is from Indonesia.

If you want more information about “Geeknesia”, please refer to the following link; http://wiznetmuseum.com/portfolio-items/my-1st-iot-device-with-geeknesia-arduino-uno-ethernet-shield-and-dht21-via-pubsub-method-2/

“Geeknesia” released the tutorial which shows how to communicate with Arduino board using MQTT protocol.

The following link is for the tutorial.

https://geeknesia.freshdesk.com/support/solutions/articles/6000020668-part-1-mqtt-arduino-to-geeknesia

We wish that this tutorial can be of help to people who want to communicate with cloud system using MQTT protocol.

Code

#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>

byte mac[]    = {  0x90, 0xA2, 0xDA, 0x00, 0x3B, 0xB6 };  //Ganti dengan MAC ethernet yang anda gunakan
byte ip[]     = { 192, 168, 1, 177 }; //Sesuaikan alamat IP dengan jaringan lokal
byte dns2[]     = {8, 8, 8, 8};
byte gateway[]     = { 192, 168, 1, 254 };
int data1;
char pubschar1 [20];
char message_buff[250];
char message_buff_call[200];
EthernetClient ethClient;
PubSubClient client("geeknesia.com", 1883, callback, ethClient);
void callback(char* topic, byte* payload, unsigned int length)
{
}

void setup()
{
  Serial.begin(9600); 
  delay(500);
  Ethernet.begin(mac, ip, dns2, gateway);
  pinMode(2, INPUT_PULLUP); //deklarasi sebagai input dan dengan internal pull up
}
void loop()
{
  if (!client.connected())  //bangun koneksi jika koneksi tidak terhubung dengan cloud
  {
    client.connect("DEVICE-ID", NULL, NULL, "iot/will", 2, 64, "DEVICE-ID");
  }

  if (digitalRead(2) == LOW) //karena pin di setting sebagai input dengan internal pull-up maka ketika switch di tekan kondisi berubah ke logika 0 atau "LOW"
  {
    Serial.println("Aktif");
    data1 = digitalRead(2);
    client.publish("iot/live", "DEVICE-ID"); //Masukkan device id
    itoa(data1, pubschar1, 10);
    String pubString  = "{\"code\":\"USERNAME:PASSWORD\","; //masukkan username dan password anda sesuai yang ada pada detail device
    pubString += "\"attributes\": {";
    pubString += "\"Status\": ""\"Aktif\",";
    pubString += "\"PIN_Logic\": " + String(pubschar1);
    pubString += "}}";
    pubString.toCharArray(message_buff, pubString.length() + 1);
    client.publish("iot/data", message_buff);
    delay(5000);
  }
  else if (digitalRead(2) == HIGH) // kondisi normal ketika switch tidak di tekan
  {
    Serial.println("Non-Aktif");
    data1 = digitalRead(2);
    client.publish("iot/live", "DEVICE-ID"); //Masukkan device id
    itoa(data1, pubschar1, 10);
    String pubString  = "{\"code\":\"USERNAME:PASSWORD\","; //masukkan username dan password anda sesuai yang ada pada detail device
    pubString += "\"attributes\": {";
    pubString += "\"Status\": ""\"Non-Aktif\",";
    pubString += "\"PIN_Logic\": " + String(pubschar1);
    pubString += "}}";
    pubString.toCharArray(message_buff, pubString.length() + 1);
    client.publish("iot/data", message_buff);
    delay(5000);
  }
}

Author Homepage: https://geeknesia.freshdesk.com/support/solutions/articles/6000020668-part-1-mqtt-arduino-to-geeknesia

Author : geeknesia

Source : https://geeknesia.freshdesk.com/support/solutions/articles/6000020668-part-1-mqtt-arduino-to-geeknesia